We were each given a piece of sponge to feel. We found that it was - flexible squishy squashy stretchy light. We then put our piece of sponge into a cup and some water was poured on top.
We found that the sponge absorbed most of the water, and became heavier, staying at the bottom of the cup. When we squeezed the water out again, the sponge stayed a little damp but had become lighter again.
Have a look at some of the photos from our experiment....